Power-hammer.



No. 657,1!4. Patented Sept. 4, 1900. L. Di. HOWARD.

POWER HAMMER.

Application filed. Feb. 24, L900.) N 0 M o d e I.)

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No. 657,|l4. Patented Sept. 4, I900. L. n. HOWARD.

POWER HAMMER.

Application filed Feb. 24, 1900.)

(No Model.)

3 SheatsShoet 2.

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POWER HAMMER.

IApplication filed Feb. 24, 1900.)

3 Sheets-Sheet 3.

(No Model.)

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Ni'rnn STATES PATENT OFFIGE.

LEONARD D. HOXVARD, OF ST. JOHNSBURY, VERMONT.

POWER- HAM M ER.

$PECIFICATION forming part of Letters Patent No. 657,1 14, datedseptember' l, 1 900.

Application filed February 24, 1900. Serial No. 6,415. (No model.)

To aZZ whom it may concerm.

Be it known that I, LEONARD D. HOWARD, a citizen of the United States,residing at St. Johnsbury, in the county of Caledonia and State ofVermont, haveinvented certainnew and useful Improvements inPower-Hammers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it apperta'ins to make and use thesame.

My invention relates to improvements in what are styled power-hammers.

It has for its objects, among other things, to effectively deliver theblow or force to the metal or substance to be operated on, to effect thedelivery of such blow or force immediatel y following the expenditure ofthe maximum movement of the hammer-actuating mechanism or pitman, toprovide for a yielding independent movement of the hammer relatively toits actuating mechanism, to possess the hammer of a variable movement orstroke, to enable it tohave a recoil movement after delivering its blowwithout interfering with the action of its actuating mechanism, and tosimplify and promote the construction and arrangement of the partsgenerally.

It consists of sundry combinations of parts substantially as will behereinafter more fully disclosed and specifically pointed out bytheclaims.

In the accompanying drawings, illustrating the preferred embodiment ofmy'invention, Figures 1 and 2 are views in elevation, one at rightangles to the other, parts also being broken away. Fig. 3 representsperspective Views of the hammer and anvil dies. Fig. 4 is a broken sideview of the anvil-adjusting lever. Figs. 5 and 6 are broken. enlargedviews, one at right angles to the other, showing more particularly thehammer-head and its guides. Fig. 7 is a transverse section taken on theline o: of Fig. 5 looking upward. Fig. 8 is a broken detailed viewdisclosing more especially the adjusting-screw connection between thesprings and the hammer-head guide. Fig. 9 is a section also taken online at :0 of Fig. 5 looking in just the op posite direction to thatindicated in Fig. 7.

It will be understood that I do not limit myself to details, as they maybechanged with out departing from the spirit of my invention and thesame yet remain intact and be protected.

. In carrying out my invention 1 provide a suitable support or casting1, upon which is mounted the cam-actuating shaft 2, with itsdriving-pulley and adjunctive parts, preferably as shown, and whichsupport or casting is adapted to form guides for the hammer 1 and anvil1 also preferably as shown. The hammer 1 is provided with a die 16, andthe anvil 1 is provided with a die 16, said dies being of peculiarconstruction, as disclosed especially in Fig. 3, and one being thecounterpart of the other. Each die is rectangular in its generaloutline, having a central lateral rib or projection 16 on one side and atapered offset or extension 16 at its opposite side, with its face orreduced end terminating flush with the corresponding surface or face ofthe die. The opposite end of said offset or extension terminates a shortdistance inward from the corresponding end or base of the die and aboutin a line with the inner surface of the rib on the opposite side of thedie, forming a rabbet at that point. The purpose of this construction isto provide for the pres 'entation of either of two surfaces or facestoward the work,as described later on.

The anvil 1 is adapted to be moved or adj usted vertically in thecasting l by means of a cam 20, secured to the axial arm or pivot 21 ofa hand-lever 22. Said arm or pivot bears in the base of the casting 1,and said cam is arranged in a hollow part of the casting inalinement'with the anvil, though not directlyin contact'therewith. Saidlever and cam provide for the ready raising and lowering of the anvil toeffect its adjustment at such height as may be required to accommodatethe work. Between the lower end of the anvil and said cam are preferablyarranged a strip of wood 19, placed next to the latter, and layers orstrips of rubber 18, placed be tween said anvil and wood, thuscushioning the anvil in place.

The hammer-head 15 is bifurcated or rccessed near its upper end, thusproviding it at said point with arms, the purpose of which will beapparent hereinafter. The hammerhead is connected to its actuating camand shaft by a pitman,, .S,aid pitman comprises two sections, oneconsisting of across-headlike portion 5, having two parallel integralrods or bars 1, reaching upward, and received into opposed slots orrecesses 4 in two contacting bars or sections 4, constituting a yoke,through which passes the camwrist pin. The yoke-sections 4 are heldtogether by nutted bolts 3. Therefore by loosening the latter the rodsor bars 1 of the link or pitman connection between. said cam-shaft andthe hammer can be moved or adjusted longitudinally, providing forvarying the length of said pitman or link, as maybe required.

The cross-head-like portion 5 has an integral pendent central extensionor portion 8, and to its ends are connected, preferably, by suitablepivot pins or bolts 6, links 7, having inward-projecting horizontal lugs7, upon which are slipped and held disks or plates 10. Similar plates ordisks 9 are held or connected to the pendant or extension 8 of part 5 bya screw a passing through said extension and projecting through oppositesides thereof and engaging screw-threaded holes in said disks or plates.This connection provides for compensating loss of tension in the springsby eflecting the required adjustment or turning of the screw, as will bereadily understood. Sandwiched between said disks or plates 9 and 10 aresprings 12 with their ends receiving bosses or projections 10 and 9,formed upon said disks or plates, respectively. These springs permit ofa yielding movement of the links 7 with relation to the central pendantor extension 8 of the pitman aforesaid, the function of which will bemore fully apparent hereinafter. Also connected to the links 7 outsideof the lugs 7 are lateral bars or ties 14, constituting the othersection of said pitman or hammer-actuating mechanism, ar-

'- ranged also alongside of the springs 12, with their ends adapted tobe bolted or pivoted to the lower ends of said links and the hammerhead15, as at 11 and 13, respectively. This arrangement, while it aids toretain the springs 12 in position between the disks or plates 9 and 10,primarily effects the suspending of the hammerhead in position. Thebolts 11, effecting the connection between the links 7 and the bars orties 14, pass through tubular end extensions or eyes of said links and,of course, openings in said bars or ties at their outer ends. The innerends of the tie-bars 14 are arranged in slots 14 in the arms 14 of thehammer-head, with screw bolts or pivots 13 passing through said arms andends.

It Will be understood from the foregoing that as the hammer receives themaximum movement or action of the actuating-cam the yielding connection,formed by the interposed springs and links in the pitman, will cause thehammer to deliver its effective blow immediately following such camaction. Thus 'the otherwise-rigid connection between the source or pointof application of power and the hammer is obviated, reducing concussionand liability of breakage or impairment of the powertransmittingmechanism. Also the stroke of the hammer is rendered variableautomatically in delivering the blow, and accordingly the force of theblow, according to the thickness of the metals or work operated upon.Further, momentum is provided for, the hammer-head being permitted toreturn or move beyond the point of connection between it and thecam-actuated member or section of the pitman after the hammer hasdelivered its blow and upon the return stroke thereof.

It will be observed, as above intimated, that the hammer and anvil dies,each having two faces, permit of the work being operated upon whenpresented either sidewise or edgewise for treatment without changing theposition of said dies. The work when placed sidewise is acted upon bythe face proper of the moving die; but when it is to be acted upon alongits edge or in the plane of its greater area it is placed in therabbeted portion or edge of the anvil-die and accordingly arranged inalinement with and receives the blow of the moving or hammer die at itscor responding rabbeted portion or edge.

Having thus fully described myinvention, what I claim, and desire tosecure by Letters Patent, is-

1. In a power-hammer, the combination of a hammer, actuating mechanismand asectional pitman connecting said hammer and actuating mechanism,one section comprising a cross-head-like portion, with parallelupward-extending arms and a central pendent arm, links connected to theends of said crosshead-like portion, springs arranged between said linksand said central pendent arm, and tie-bars connected to said links andto the hammer-head, respectively, and arranged laterally of saidsprings, substantially as set forth.

2. In a power-hammer, the combination of a hammer, actuating mechanism,and a sectional pitman connecting said actuating mechanism and hammer,one section comprising a cross-head-like portion having a centralpendent arm, links connected to the ends of said cross-head-likeportion, springs arranged between said links and arm, a screw carried bysaid arm and adapted to compensate tension of said springs, and theother section of said pitman comprising tie-bars connected to said linksand to the hammerhead, and arranged laterally of said springs,substantially as described.

3. In a power-hammer, the combination of a hammer, actuating mechanismand a sectional pitman comprising links, and springs adapted to bearupon said links, and tie-bars connected to said links and arrangedlaterally of said springs, and the hammerhead having its arms providedwith reduced or stepped upper end portions, said tie-bars ICOhavinglateralstuds connected to said reduced said actuating mechanism,links connected or stepped portions of thehammer-head, subto saidcross-head-like portion, and springs stantially as set forth. adapted tobear upon said links, and tie-bars 4. In a power-hammer, the combinationof connecting links to the hammer-head, sub- 15 5 a hammer, actuatingmechanism, and a secstantially as set forth.

tional pitman, adapted to connect said ham- In testimony whereof I aifixmy signature mer and actuating mechanism, one section I in presence oftwo Witnesses.

comprising a cross-head-like portion having LEONARD D. HOWARD.

upWard-extendin g parallel arms, parallel coni lVitnesses: I0 tactingslotted plates adapted to receive be- A. F. NICHOLS,

tween them said parallel arms and carried by ROLFE COBLEIGH.

